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I have noticed the same when trying 240fps indoors and this is what I think.

Flickering: Indoor lighting flickers a lot, but fast enough so we don't see it with our eyes. If you use 240fps with indoor lighting you will be taking "pictures" so fast that you will actually see the light go on-off-on-off etc like 50 or 60 times/second.

Grainy: Since the light will appear to go on-off-on-off between every frame in the movie, it will be very big difference between each frame. And because of that the compression applied to the movie will make it look very grainy.

There are also some differences on how the camera processes the images at higher framerates. This link here has some clarifications by one of the guys producing the official GoPro ads videos. It explains a lot on the different modes, further than what each resolution and frame rate means.

There are also some differences on how the camera processes the images at higher framerates. This link here has some clarifications by one of the guys producing the official GoPro ads videos. It explains a lot on the different modes, further than what each resolution and frame rate means.

There are also some differences on how the camera processes the images at higher framerates. This link here has some clarifications by one of the guys producing the official GoPro ads videos. It explains a lot on the different modes, further than what each resolution and frame rate means.

The only time you will need to record something at 240 fps is when you are recording something that is moving Extremely fast. This is more of a feature to "brag" about than something you will use on a regular basis. First of all the WVGA is a really low resolution image. Second of all if 120fps is not good enough then you bought the wrong camera I use 1080 @ 60fps and i can slow it down to 5fps playback speed.